3D Viologen-based covalent organic framework for selective and efficient adsorption of ReO4−/TcO4
[Display omitted] •A 3D cationic covalent organic framework (TFAM-BDNP) was synthesized via Zincke reaction.•TFAM-BDNP exhibits high adsorption capacity and extremely fast exchange kinetic for ReO4−.•TFAM-BDNP demonstrates remarkable selectivity for ReO4−.•TFAM-BDNP has outstanding removal efficienc...
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Published in | Separation and purification technology Vol. 312; p. 123409 |
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Main Authors | , , , , , , , |
Format | Journal Article |
Language | English |
Published |
Elsevier B.V
01.05.2023
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Subjects | |
Online Access | Get full text |
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Summary: | [Display omitted]
•A 3D cationic covalent organic framework (TFAM-BDNP) was synthesized via Zincke reaction.•TFAM-BDNP exhibits high adsorption capacity and extremely fast exchange kinetic for ReO4−.•TFAM-BDNP demonstrates remarkable selectivity for ReO4−.•TFAM-BDNP has outstanding removal efficiency of ReO4− from simulated Hanford flow sample.
Due to the long half-life and high environmental mobility, the selective and efficient capture of TcO4− from nuclear effluents is very important, but it is still very challenging. Herein, we design and synthesize a novel three-dimensional (3D) cationic covalent organic framework (TFAM-BDNP) via Zincke reaction for selective capture of TcO4−/ReO4−. TFAM-BDNP exhibits high adsorption capacity (998 mg g−1) and extremely fast exchange kinetic (60 s) for ReO4− (the non-radioactive alternative to TcO4−), attributing to the open 3D hydrophobic channels, abundant active sites, and high chemical stability. More importantly, TFAM-BDNP shows good adsorption performance for ReO4− in the presence of significant excess competing anions with a wide pH value range of 2 to 12. Under complex simulated Hanford flow sample, TFAM-BDNP has outstanding removal efficiency of ReO4−. The adsorption mechanism of ReO4− is mainly caused by anion exchange process. This study provides a novel adsorbent for efficient capture of TcO4−/ReO4− in complex environmental systems and exploits an effective strategy for broadening the types of 3D COFs. |
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ISSN: | 1383-5866 1873-3794 |
DOI: | 10.1016/j.seppur.2023.123409 |